Form singular and plural nouns including frequently-occurring irregulars

Add -s and -es to make regular plurals (cats, dogs, foxes, buses). Memorize and use frequently-occurring irregulars (foot/feet, child/children, mouse/mice, tooth/teeth, man/men, woman/women, person/people, fish/fish, sheep/sheep).

Mastery threshold

90%

Min instances

Typical minutes

Spaced intervals (days)

1, 3, 7, 14, 30, 60

Prereqs

Identify and produce nouns (person, place, thing, idea)

Successors

Recognize and use collective nouns (L.2.1.a)

Common misconceptions

Over-regularizes: 'foots', 'childs', 'mouses' (the most common K-1 overgeneralization).
Doubles -es onto words that don't need it ('catses', 'dogses').

Exercise pool (3)

Diff	Stem	Type
1	Write the plural: cat, dog, ball, fox, bus.	plural form
3	Write the plural: foot, child, mouse, tooth, fish.	irregular plural
4	Use the plural form correctly in a sentence: 'My dentist counted my ___.' (tooth → ?)	sentence with plural